Electrical heating unit



Dec. 18 1923.

M. SIMON ELECTRICAL HEATING UNIT Original Filed April 25. 1921 INVENTOR.

' ""ATTORNEY.

la'tenled @en l, i923..

entre@ starts rnraN'r trice.

MERECE SEMQET, ST. L'US, MISSGUR.

Application iler! April 25, 1922., Serial No. @64,5302 Renewed May 5, w23.

scribed particularly pointed out in the u ee claims. lin describing the various arrangements employed and shown in the drawings hereto attached and described in the speciieation, "i do not limit my invention to the precise torni or construction or" apparatus shown, or the several parts thereto, inas-l much as various alterations may be made uithout changing the scope ot my invention. I

ln application Serial No. 464,201, l have shown an electrical heating unit with a, cas` ing adapted to make effective contact with a bot y to be heated. In this application l use a spring to make such Contact and in application Serial No. 464,203 I use manually controlled means for this purpose.

ln the drawings Fig. 1 is an elevational view of a heating unit embodying my invention with a portion broken out to show the interior arrangement thereof. Fig. 2 is a cross sectional View of the heating unit on the line fir-B in Fig. 1. Fig. 3 is a modilied form of heating unit likewise having a portion broken. out to show the interior arrangement thereof. Fig. 4 is a cross-sectinal view ot the heating unit on the line lU-D in Fig. 3. Fig. 5 is an elevational view oi another modified form of heating unit with a portion broken out to show the interior arrangement thereof. Fig. 6 is a cross sectional View of the heating unit ,shown Fig. 5, on the line E-F in that n ure.

in the drawings 10 is a resistor comprisinga resistance element 11 and insulation 12. 13 is a casing of heat conducting :naterial preferably of copperA and preferably having double walls, as shown in the drawings 1d is an outer wall and 15 is an inner wall. 16 are the ends of the casing which are preferably rounded, In Fi 2, the casin is shown, formed rom a sheet of metal.. ne edge of the metal is shown at 1i' and the other edge is 'shown at 18.

resland 19 is a heat resisting spring element comprising a continuous double Walled open seam member 20, preferably having the form of an open seam cylinder. 21 is heat resisting material, such as mica, compressed within the double walled. member 20. ln Figures 3 and d, the edges ot 'the 22 oi the casing are attached to the springs 23. lin Figures 5 and 6, the two resistors 10 are positioned on the arms 24 of a l3- shaped spring 25. 26 are terminals. These heating units are designed to be inserted into apertures of objects to be heated. The

heating units shown in Figures 1 and 5 however, also may be slipped over and upon objects of suitable form which are to be heated. By reason of the springs the casing of the resistor is pressed against the walls of the object to be heated, so that a good thermal contact is obtained. The spring shown in Figure 1 is preferably formed from a seamless @opper tube. After tlattening the tube a heat resisting material' such as mica is inserted between the flattened walls of the tube and the walls are compressed upon the mica.- The spring is then formed in the desired shapes, preferably that of an open-seam cylinder.

1 claim:

1. ln an electrical heating unit the combination of an electrical resistor, a casing of heat conducting material therefor, and a spring adapted to press the casing against an object to be heated.

2. ln an electrical heating unit, the combination of an electrical resistor, a casing of heat conducting material therefor and a spring adapted to press the casing against the inner periphery of an object to be heated.

3. ln an electrical heating unit a spring, an electrical heating unit carried thereby, and a casing of heat conducting material on the electrical resistor; the spring being arranged to press the casing against the inner periphery of an object to be heated so as to secure a good thermal-contact therewith.

4. ln an .electrical heating unit a spring of a continuous heat conducting material a heat resisting material compressed within the wall of said spring, an electrical resister, a casing therefor; which casing is adapted to be pressed by the spring against an object to be heated.

5. An electrical heating unit comprising a spring, an electrical resistor intermediately positioned?. on soidl spiiing, and a casing of lieol .conducting mal/arial about said i'esisttol.

6. An article ol mamiaotuie comprising a resilient double Wall open seam cylinder ol lient conducting mammal and a heat rol sisting otoal Within will comprosslod by who wolle ol tho oylimlol.,

www@ l 'l'. l aticle. of manllfslctui'egv comprising a, lesilinl; contipumls double Walled member of lwal, oonduotmg material, and heat resist lil Wallis? @l will member.'

omo@ smoli.

im material W'thn anal compressed by tho 

